HANDY  TABLES 


FOR 


ELECTRICAL  AND  STEAM 


ENGINEERS 


Copyright  1901  by  American  Electrician  Company 


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# 


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^taming  mib  |Tabor. 

LIBRARY 


University  of  Illinois. 


CLASS. 


BOOK. 


VOLUME . 


'p  ■a.Yvy 

Accession  No. 


# 


OsS2S2s^522g2S82^2  t©=^$=  !S=i#-5g2^SS=^=^:^=S330 

INTRODUCTORY. 


Tables  of  any  kind  are  useful  in  arriving  at  approximate 
results  without  extensive  calculation,  but  a user  of  tables 
should  constantly  bear  in  mind  the  fact  that  some  results  must 
be  only  approximate  because  it  is  not  practicable  to  construct  a 
table  that  will  cover  every  possible  case  or  contain  all  practical 
factor  values.  To  illustrate — Table  III  is  absolutely  accurate  as 
to  the  factor  values  given,  but  it  will  not  serve  to  find  the 
current  taken  by  a motor  of  83  per  cent  efficiency.  This  value 
can  be  approximated  by  taking  a figure  midway  between  the 
current  at  82  and  that  at  84  per  cent.  Again,  the  table  is  not 
accurate,  of  course,  for  115-volt  and  230- volt  motors;  but  it  can 
be  used  as  a guide  without  serious  error. 

Most  of  the  tables  contained  in  this  pamphlet  are  constructed 
on  the  ordinary  plan  of  giving  three  sets  of  interdependent  fac- 
tor values,  so  that  by  assuming  any  two  the  other  one  may  be 
found.  Table  XII  is  made  on  a slightly  different  plan,  and 
embraces  four  factors — cylinder  diameter,  horse-power,  mean- 
effective  pressure  and  stroke  X r.p.m.  The  composite  factor, 
stroke  X r.p.m.,  corresponds  in  character,  but  not  in  value,  to 
piston  speed;  it  is  employed  because  it  is  much  less  trouble  to 
multiply  the  stroke  by  the  revolutions  than  it  is  to  calculate 
piston  speed  in  feet  per  minute.  The  method  of  using  the  table 
is  indicated  in  the  footnotes. 


REf 


6 


n 


A 


Table  I. 


Copper  Wires  for  Electric  Light  and  Power  Circuits. 


Pounds 

per 
1000  ft. 

Ohms  per  1000  feet 
P -S  o3-_o*  at  different  tem- 


rr 


^s) 


W ^ E-t 


peratures,  Fah- 
renheit. 

60° 


110-volt  constants.* 

For  computing1  load  or  distance 
at  75°  F.  corresponding  to  dif- 
ferent line  losses.! 

1%  1 y2%  2%  2y2%  3% 


Maximum 

current. 

££  ■ag-? 

(§i£’a^ 


540 

340 

215 


810 

510 

320 


1,080 

680 

430 


1,350 

850 

535 


1,620 

1,020 

645 


fttriwS  f?n<rtbnsjant-s  ln  thl  bo/?y  °J-  !he  table  amperes  to  find  the  distance 

len&th  of  wire)  or  by  the  distance  to  find  the  current, 
line  losses  at  heads  of  columns  are  percentages  of  the  delivered  e m f 


Table  II. — Incandescent  Lamp  Current. 

Showing  the  current  in  amperes  required  by  groups  of  16-c.p.  incandescent  lamps  of  the 
efficiencies  and  voltages  most  commonly  used. 


3.1  watt. 

Lamps.  110  v.  115  v. 


3V2  watt. 

110  v.  115  v. 


<F' 


22 

24 

25 

26 

28 

30 

32 

34 

35 

36 
38 
40 
42 

44 

45 

46 
48 
60 


4.51 

4.96 

6.41 

6.86 

6.31 

6.76 

7.21 

7.67 

8.12 

8.57 

9.02 

9.92 

10.82 

11.27 

11.73 

12.63 
13.53 
14.43 
15.33 
15.78 

16.23 

17.13 

18.04 

18.94 

19.84 

20.29 

20.74 

21.64 
22.55 


4.31 

4.74 

5.18 

5.61 

6.04 

6.47 

6.9 

7.33 

7.76 

8.2 

8.63 

9.49 

10.35 

10.78 

11.22 

12.08 

12.94 

13.8 

14.66 

15.1 

15.53 

16.39 

17.25 

18.12 

18.98 

19.41 

19.84 

20.7 

21.57 


5.09 

5.6 

6.11 

6.62 

7.13 

7.64 
8.15 

8.65 
9.17 
9.67 

10.18 

11.2 

12.22 

12.73 

13.24 

14.25 
15.27 
16.29 
17.31 
17.82 

18.33 

19.35 

20.36 
21.38 
22.4 

22.91 

23.42 

24.44 

25.45 


The  current 
current  for  ten 
by  7 lamps  of  3. 


4.87 

5.36 

5.84 

6.33 

6.82 

7.3 

7.79 

8.28 

8.77 

9.25 

9.74 

10.71 

11.69 

12.18 

12.66 

13.64 

14.61 

15.58 

16.56 

17.04 

17.53 

18.5 
19.48 
20.45 
21.43 

21.91 

22.4 

23.37 

24.35 


3.1  watt. 

Lamps,  110  v.  115  v. 


3VZ  watt. 
110  v.  115  v. 


70 

72 

74 

75 

76 
78 
80 
82 

84 

85 

86 
88 
90 
92 

94 

95 

96 


23.45 

24.35 

24.8 

25.25 

26.15 

27.06 
27.96 
28.86 
29.31 
29.76 

30.66 

31.57 
32.47 
33.37 
33.82 

34.27 

35.17 

36.07 
36.98 
37.88 

38.33 

38.78 

39.68 

40.58 

41.49 

42.39 

42.84 

43.29 

44.19 


required  by  groups  of  less  than  10  lamps  may 
tirpes  the  actual  number  and  dividing  it  by  10. 
1 Watts  efficiency  and  110  volts  is  3.157  amperes 


22.43 

23.29 

23.72 

24.15 

25.02 

25.88 

26.74 

27.6 

28.04 
28.47 

29.33 

30.19 

31.05 
31.92 
32.35 

32.78 

33.64 

34.51 

35.37 

36.23 

36.66 

37.09 

37.96 

38.82 

39.68 

40.55 

40.98 

41.41 

42.27 

be  found 
Thus  the 


26.47 

27.49 

28. 

28.51 

29.53 

30.55 

31.56 
32.58 
33.09 
33.6 

34.62 

35.64 

36.66 

37.67 
38.18 


25.32 

26.3 
26.78 
27.27 
28.25 

29.22 
30.19 
31.17 
31.65 

32.14 

33.11 
34.09 
35.06 

36.04 
36.52 

37.01 
37.98 
38.96 
39.93 

40.91 

41.39 
41.88 
42.85 
43.83 
44.8 

45.78 
46.26 
46.75 
47.73 
by  taking  the 
current  taken 


39.71 

40.73 

41.75 

42.77 

43.28 

43.78 
44.8 
45.82 
46.84 

47.86 
48.37 

48.87 
49.89 


Table  III. — Current  Required  by  110-Volt  and  220-Volt  Direct-Cur- 
rent Motors. 


110- Volt  Motors. 


>» 

V* 

% 

% 

% 

1 

1% 

2 

2% 

3 

4 

5 

7% 

10 

0 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP- 

O) 

220- Volt  Motors. 

6 

V2 

% 

1 

i y2 

2 

3 

4 

5 

6 

7% 

10 

15 

20 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

HP. 

60 

2.83 

4.24 

5.65 

8.47 

11.3 

16.95 

22.6 

28.25 

33.9 

42.38 

56.51 

84.77 

113. 

62 

2.73 

4.1 

5.47 

8.2 

10.94 

16.41 

21.87 

27.35 

32.81 

41.02 

54.69 

82.04 

109.38 

64 

2.65 

3.97 

5.3 

7.95 

10.6 

15.89 

21.19 

26.49 

31.79 

39.73 

52.98 

79.47 

105.95 

66 

2.57 

3.85 

5.14 

7.7 

10.27 

15.41 

20.55 

25.69 

30.83 

38.53 

51.38 

77.07 

102.75 

68 

2.49 

3.74 

4.98 

7.48 

9.97 

14.96 

19.95 

24.93 

29.92 

37.40 

49.87 

74.8 

99.73 

70 

2.42 

3.63 

4.84 

7.27 

9.69 

14.53 

19.38 

24.22 

29.06 

36.33 

48.44 

72.66 

96.88 

72 

2.35 

3.53 

4.71 

7.06 

9.42 

14.13 

18.84 

23.55 

28.26 

35.32 

47.1 

70.64 

94.19 

74 

2.29 

3.44 

4.58 

6.87 

9.16 

13.75 

18.33 

22.91 

27.49 

34.37 

45.82 

68.73 

91.64 

75 

2.26 

3.39 

4.52 

6.78 

9.04 

13.56 

18  08 

22.61 

27.13 

33.91 

45.21 

67.82 

90.42 

76 

2.23 

3.35 

4.46 

6.69 

8.92 

13.38 

17.85 

22.31 

26.77 

33.46 

44.62 

66.92 

89.23 

78 

2.17 

3.26 

4.35 

6.52 

8.69 

13.04 

17.39 

21.74 

26.08 

32.60 

43.47 

65.21 

86.95 

80 

2.12 

3.18 

4.24 

6.36 

8.48 

12.72 

16.95 

21.19 

25.43 

31.79 

42.39 

63.58 

84.77 

82 

.... 

3.1 

4.13 

6.2 

8.27 

12.41 

16.54 

20.68 

24.  SI 

31.02 

41.35 

62.03 

82.70 

84 

.... 

3.03 

4.04 

6.05 

8.07 

12.11 

16.15 

20.18 

24.22 

30.27 

40.37 

60.55 

80.74 

85 

• • • • 

2.99 

3.99 

5.98 

7.98 

11.97 

15.96 

19.95 

23.94 

29.92 

39.89 

59.84 

79.73 

86 

• • - . 

3.94 

5.91 

7.88 

11.83 

15.77 

19.72 

23.66 

29.57 

39.43 

59.14 

78.86 

88 

.... 

3.85 

5.78 

7.7 

11.56 

15.41 

19.27 

23.12 

28.9 

38.53 

57.8 

77.07 

90 

3.77 

5.65 

7.53 

11.30 

15.07 

18.84 

22.6 

28.26 

37.68 

56.56 

75.35 

91 

11.18 

14.9 

18.63 

22.36 

27.95 

37.26 

55.89 

74.52 

92 

11.06 

14.74 

18.43 

22.11 

27.64 

36.86 

55.29 

73.72 

93 

.... 

10.94 

14.58 

18.23 

21.88 

27.35 

36.46 

54.69 

72.92 

The  heavy  figures  indicate  the  current  taken  by  motors  of  average  efficiency.  When 
there  are  two  in  one  column,  the  upper  figure  refers  to  110-volt  motors  and  the  lower 
one  to  220-volt  machines. 


Table  IV. — Current  Required  by  500-Volt  Direct-Current  Motors. 


■ 


H § 
o 

1 

HP. 

iy2 

HP. 

2 

HP. 

3 

HP. 

5 

HP. 

7V2 

HP 

10 

HP. 

15 

HP. 

20 

HP. 

25 

HP. 

30 

HP. 

60 

2.49 

3.73 

4.97 

7.46 

12.43 

18.65 

24.87 

37.3 

49.74 

62.17 

74.60 

62 

2.41 

3.61 

4. SI 

7.22 

12.03 

18.05 

24.07 

36.1 

48.13 

60.16 

72.2 

64 

2.33 

3.5 

4.66 

6.99 

11.66 

17.47 

23.31 

34.97 

46.63 

58.28 

69.94 

66 

2.26 

3.39 

4.52 

6.77 

11.29 

16.93 

22.58 

33.86 

45.15 

56.44 

67.73 

68 

2.19 

3.29 

4.39 

6.58 

10.97 

16.46 

21.94 

32.92 

43.88 

54.86 

65.83 

70 

2.13 

3.2 

4.26 

6.39 

10.66 

15.98 

21.31 

31.97 

42.63 

53.28 

63.95 

72 

2.07 

3.11 

4.14 

6.22 

10.36 

15.54 

20.72 

31.08 

41.45 

51.8 

62.17 

74 

2.02 

3.02 

4.03 

6.05 

10.08 

15.13 

20.16 

30.24 

40.33 

50.14 

60.49 

75 

1.99 

2.98 

3.98 

5.97 

9.95 

14.92 

19.89 

29.84 

39.79 

49.73 

59.68 

76 

1.96 

2.94 

3.93 

5.89 

9.82 

14.72 

19.63 

29.45 

39.26 

49.08 

58.9 

73 

1.91 

2.87 

3.83 

5.74 

9.56 

14.35 

19.13 

28.69 

38.26 

47.82 

57.39 

80 

1.86 

2.8 

3.73 

5.6 

9.32 

13.99 

18.65 

27.97 

37.3 

46.63 

55.95 

82 

1.82 

2.73 

3.64 

5.46 

9.1 

13.65 

18.2 

27.29 

36.39 

45.49 

54.59 

84 

1.78 

2.66 

3.55 

5.33 

8.88 

13.32 

17.76 

26.64 

35.52 

44.41 

53.29 

85 

1.76 

2.63 

3.51 

5.27 

8.78 

13.16 

17.55 

26.33 

35.11 

43.88 

52.66 

86 

1.73 

2.60 

3.47 

5.21 

8.67 

13.01 

17.35 

26.02 

34.7 

43.37 

52.05 

88 

1.7 

2.54 

3.39 

5.09 

8.48 

12.72 

16.96 

25.43 

33.91 

42.39 

50.87 

90 

1.66 

2.49 

3.32 

4.97 

8.29 

12.43 

16.58 

24.87 

33.16 

41.45 

49.74 

91 

1.64 

2.46 

3.28 

4.92 

8.2 

12.  S 

16.4 

24.6 

32.79 

40.99 

49.19 

92 

1.62 

2.43 

3.24 

4.87 

8.11 

12.16 

• 16.22 

24.33 

32.44 

40.55 

48.66 

93 

1.6 

2.41 

3.21 

4.81 

8.02 

12.03 

16.04 

24.07 

32.09 

40.11 

48.13 

The  heavy  figures  indicate  current  taken  by  motors  of  average  efficiency. 


Table  V. — Single-Phase  Motor  Current, 


Showing-  the  current  required  by  100-volt  single-phase  alternating-current  mo- 
tors per  horse-power  of  output. 

A 200-volt  motor  requires  one-half  the  current,  and  a 400-volt  motor  one-quarter  the 
current  given  by  the  table. 

A two-phase  motor  requires  one-half  the  current  per  phase  of  a single-phase  motor. 


Effi- 

ciency. 

.78 

* 

POWER  FACTOR  OF  THE  MOTOR. 

.82  .84  .85  .86  .87  .88  .89 

.90 

.91 

.92 

’75% 

12.75 

12.43 

12.13 

11.84 

11.70 

11.57 

11.43 

11.30 

11.18 

11.05 

10.93 

10.81 

76% 

12.57 

12.26 

11.96 

11.68 

11.54 

11.40 

11.27 

11.14 

11.02 

10.90 

10.78 

10.66 

77% 

12.41 

12.10 

11.80 

11.52 

11.38 

11.25 

11.12 

11. 

10.87 

10.75 

10.53 

10.52 

78% 

12.25 

11.95 

11.66 

11.38 

11.24 

11.11 

10.99 

10.86 

10.74 

10.62 

10.50 

10.39 

79% 

12.10 

11.80 

11.51 

11.24 

11.11 

30.98 

10.85 

10.73 

10.61 

10.49 

10.38 

10.26 

80% 

11.95 

11.65 

11.36 

11.09 

10.96 

10.83 

10.71 

10.59 

10.47 

10.35 

10.24 

10.13 

•81% 

11.80 

11.51 

11.23 

10.96 

10.83 

10.71 

10.58 

10.46 

10.34 

10.23 

10.12 

10.01 

82% 

11.66 

11.37 

11.09 

10.83 

10.70 

10.58 

10.46 

10.34 

10.22 

10.11 

10. 

9.89 

83% 

11.51 

11.22 

10.95 

10.69 

10.56 

10.44 

10.32 

10.20 

10.09 

9.97 

9.87 

9.76 

•84% 

11.38 

11.10 

10.83 

10.57 

10.44 

10.32 

10.20 

10.09 

9.97 

9.86 

9.76 

9.65 

85% 

11.24 

10.96 

10.69 

10.44 

10.31 

10.19 

10.08 

9.96 

9.85 

9.74 

9.63 

9.55 

86% 

11.11 

10.83 

10.57 

10.33 

10.20 

10.08 

9.96 

9.85 

9.74 

9.63 

9.52 

9.42 

87% 

10.98 

10.71 

10.45 

10.20 

10.08 

9.96 

9.85 

9.74 

9.63 

9.52 

9.41 

9.31 

ss% 

10.87 

10.60 

10.34 

10.09 

9.97 

9.85 

9.74 

9.63 

9.53 

9.42 

9.32 

9.21 

89% 

10.74 

10.47 

10.22 

9.97 

9.86 

9.74 

9.63 

9.52 

9.41 

9.31 

9.21 

9.11 

90% 

10.63 

10.36 

10.11 

9.87 

9.75 

9.64 

9.53 

9.42 

9.31 

9.21 

9.11 

9.01 

91% 

10.51 

10.25 

10. 

9.76 

9.64 

9.53 

9.42 

9.32 

9.21 

9.11 

9.01 

8.91 

32% 

10.39 

10.13 

9.89 

9.65 

9.54 

9.43 

9.32 

9.21 

9.11 

9.01 

8.91 

8.81 

Table  VI. — Three-Phase  Motor  Current. 


Showing  the  current  per  phase  required  by  100-volt  three-phase  motors  per  horse- 
power of  output. 

A 200-volt  motor  requires  one-half  the  current,  and  a 400-volt  motor  one-quarter  the 
current  given  by  the  table. 


jg  « POWER  FACTOR  OF  THE  MOTOR. 


H-3 

o 

.78 

S 

.82 

00 

lO 

GO 

.86 

.87 

.88 

.89 

.90 

.91 

.92 

75% 

7.36 

7.18 

7. 

6.84 

6.76 

6.68 

6. 

6.52 

6.45 

6.38 

6.31 

6.24 

76% 

7.26 

7.08 

6.91 

6.74 

6.66 

6.58 

6.51 

6.43 

6.36 

6.29 

6.22 

6.15 

77% 

7.16 

6.99 

6.81 

6.65 

6.57 

6.5 

6.42 

6.35 

6.28 

6.21 

6.14 

6.07 

'78% 

7.07 

6.9 

6.73 

6.57 

6.49 

6.41 

6.35 

6.27 

6.2 

6.13 

6.06 

6. 

79% 

6.99 

6.81 

6.65 

6.49 

6.41 

6.34 

6.26 

6.19 

6.13 

6.06 

5.99 

5.92 

80% 

6.9 

6.73 

6.56 

6.4 

6.33 

6.25 

6.18 

6.11 

6.04 

5.98 

5.91 

5.85 

81% 

6.81 

6.65 

6.48 

6.33 

6.25 

6.18 

6.11 

6.04 

5.97 

5.91 

5.84 

5.78 

82% 

6.73 

6.57 

6.4 

6.25 

6.18 

6.11 

6.04 

5.97 

5.9 

5.84 

5.77 

5.71 

83% 

6.65 

6.48 

6.32 

6.17 

6.1 

6.03 

5.96 

5.89 

5.83 

5.76 

5.7 

5.64 

84% 

6.57 

6.41 

6.25 

6.1 

6.03 

5.96 

5.89 

5.83 

5.76 

5.69 

5.63 

5.57 

85% 

6.49 

6.33 

6.17 

6.03 

5.95 

5.88 

5.82 

5.75 

5.69 

5.62 

5.56 

5 5 

86% 

6.41 

6.25 

6.1 

5.96 

5.89 

5.82 

5.75 

5.69 

5.62 

5.56 

5.5 

5.44 

87% 

6.34 

6.18 

6.03 

5.89 

5.82 

5.75 

5.69 

5.62 

5.56 

5.5 

5.43 

5.38 

88% 

6.28 

6.12 

5.97 

5.83 

5.76 

5.69 

5.62 

5.56 

5.5 

5.44 

5.38 

5.32 

89% 

6.2 

6.04 

5.9 

5.76 

5.69 

5.62 

5.56 

5.5 

5.43 

5.38 

5.32 

5.26 

90% 

6.14 

5.98 

5.84 

5.7 

5.63 

5.57 

5.5 

5.44 

5.38 

5.32 

5.26 

5.2 

91% 

6.07 

5.92 

5.77 

5.63 

5.57 

5.5 

5.44 

5.38 

5.32 

5.26 

5.2 

5.14 

82% 

6. 

5.85 

5.71 

5.57 

5.51 

5.44 

5.38 

5.32 

5.26 

5.2 

5.14 

5.09 

Table  VII. — Electrical  Horse-Power, 


Figures  in  body  of  table  are  Amperes  required  to  give  the  Horse-power  in  the  side 
columns,  at  Voltage  at  top  of  columns. 


Amperes  in  body  of  table.  Volts  at 
column  heads. 

HP.  110  115  220  230  500 

Amperes  in  body  of  table.  Volts 
Column  heads. 

HP.  110  115  220  230 

at 

500 

% 

1.679 

1.621 

.8396 

.8105 

.373 

48 

322.4 

311.3 

161.2 

155.65 

71.62 

% 

3.358 

3.243 

1.6792 

1.6215 

.746 

49 

329.1 

317.8 

164.55 

158.9 

73.11 

% 

5.038 

4.864 

2.5189 

2.432 

1.119 

50 

335.85 

324.3 

167.925 

162.15 

74.6 

1 

6.717 

6.486 

3.3585 

3.243 

1.492 

51 

342.55 

330.76 

171.275 

165.38 

76.09 

2 

13.435 

12.972 

6.7175 

6.485 

2.984 

52 

349.3 

337.25 

174.65 

168.625 

77.58 

3 

20.15 

19.458 

10.075 

9.729 

4.476 

53 

356. 

343.75 

178. 

171.875 

79.08 

4 

26.87 

25.944 

13.435 

12.972 

5.968 

54 

362.7 

350.2 

181.35 

175.1 

80.57 

5 

33.585 

32.429 

16.7925 

16.2145 

7.609 

55 

369.4 

356.7 

184.7 

178.35 

82.06 

6 

40.3 

38.914 

20.15 

19.457 

8.952 

56 

376.15 

363.2 

188.075 

181.6 

83.55 

7 

47.02 

45.402 

23.51 

22.701 

10.444 

57 

382.85 

369.7 

191.425 

184.85 

85.04 

8 

53.74 

51.888 

26.87 

25.944 

11.94 

58 

389.6 

376.2 

194.8 

188.1 

86.54 

9 

60.45 

58.72 

30.225 

29.36 

13.43 

59 

396.3 

382.66 

198.15 

191.33 

88.03 

10 

67.17 

64.861 

33.585 

32.431 

14.92 

60 

403. 

389.15 

201.5 

194.575 

89.52 

11 

73.89 

71.35 

36. 945 

35.675 

16.412 

61 

409.75 

395.64 

204.875 

197.82 

91.01 

12 

80.6 

77.83 

40.3 

38.915 

17.904 

62 

416.45 

402.1 

208.225 

201.05 

92.5 

13 

87.32 

84.32 

43.66 

42.16 

19.396 

63 

423.15 

408.6 

211.575 

204.3 

93.99 

14 

94.04 

90.805 

47.02 

45.4025 

20.887 

64 

429.9 

415.1 

214.95 

207.55 

95.49 

15 

101.75 

97.29 

50.875 

48.645 

22.38 

65 

436.6 

421.56 

218.3 

210.78 

96.98 

16 

107.46 

103.76 

53.73 

51.88 

23.872 

66 

443.3 

428.08 

221.65 

214.04 

98.47 

17 

114.18 

110.25 

57.09 

55.125 

25.364 

67 

450. 

434.55 

225. 

217.275 

99.96 

18 

120.91 

116.75 

60.455 

58.375 

26.S56 

68 

456.75 

441. 

228.375 

220.5 

101.45 

19 

127.62 

123.23 

63.81 

61.615 

28.348 

69 

463.5 

447.5 

231.75 

223.75 

102.95 

20 

134.35 

129.72 

67.175 

64.86 

29.84 

70 

470.2 

454. 

235.1 

227. 

104.44 

21 

141.05 

136.21 

70.525 

68.105 

31.342 

71 

476.9 

460.5 

238.45 

230.25 

105.93 

22 

147.76 

142.7 

73.88 

71.35 

32.824 

72 

483.6 

467. 

241.8 

233.5 

107.42 

23 

154.49 

149.18 

77.245 

74.59 

34.317 

73 

490.3 

473.46 

245.15 

236.7 

108.9 

24 

161.2 

155.66 

80.6 

77.83 

35.808 

74 

497.05 

479.95 

248.525 

239.975 

110.4 

25 

167.93 

162.15 

83.965 

81.075 

37.3 

75 

503.8 

186.45 

251.9 

243.225 

111.9 

23 

174.64 

168.64 

87.32 

84.32 

38.793 

76 

510.5 

192.9 

255.25 

246.45 

113.4 

27 

181.35 

175.12 

90.675 

87.56 

40.284 

77 

517.2 

499.4 

258.6 

249.7 

114.9 

28 

188.07 

181.61 

94.035 

90.805 

41.775 

78 

523.9 

505.9 

261.95 

252.95 

116.4 

29 

194.8 

188.1 

97.4 

94.05 

43.27 

79 

530.6 

512.2 

265.3 

256.1 

117.9 

30 

201.5 

194.58 

100.75 

97.29 

44.76 

80 

537.4 

518.9 

268.7 

259.45 

119.4 

31 

208.22 

201.05 

104.11 

100.525 

46.25 

81 

544.1 

525.4 

272.05 

262.7 

120.85 

32 

214.95 

207.55 

107.475 

103.775 

47.745 

82 

550.8 

531.8 

275.4 

265.9 

122.35 

33 

221.66 

214.04 

110.83 

107.02 

49.238 

83 

555.5 

538.4 

277.75 

269.2 

123.84 

34 

228.38 

220.52 

114.19 

110.26 

50.73 

84 

564.2 

544.8 

282.1 

272.4 

125.33 

35 

235.1 

227. 

117.55 

113.5 

52.22 

85 

571. 

551.3 

285.5 

275.65 

126.  S 

36 

241.8 

233.5 

120.9 

116.75 

53.71 

86 

577.7 

557.8 

288.85 

278.9 

128.3 

37 

248.5 

239.97 

124.25 

119.985 

55.205 

87 

584.4 

564.3 

292.2 

282.15 

129.8 

38 

255.25 

246.45 

127.625 

123.275 

56.698 

88 

591.1 

570.8 

295.55 

285.4 

131.3 

39 

261.95 

252.95 

130.975 

126.475 

58.19 

89 

597.8 

577.2 

298.9 

288.6 

132.8 

40 

268.68 

259.43 

134.34 

129.715 

59.68 

90 

604.5 

583.7 

302.25 

291.85 

134.3 

41 

275.4 

265.9 

137.7 

132.95 

61.17 

91 

611.2 

590.2 

305.6 

295.1 

135.8 

42 

282.1 

272.4 

141.05 

136.2 

62.66 

92 

618. 

596.7 

309. 

298.35 

137.25 

43 

288.8 

278.9 

144.4 

139.45 

64.16 

93 

624.7 

603.2 

312.35 

301.6 

138.75 

44 

295.55 

285.37 

147.775 

142.685 

65.65 

94 

631.4 

609.7 

315.7 

304.85 

140.25 

45 

302.25 

291.85 

151.125 

145.925 

67.14 

96 

644.8 

622.6 

322.4 

311.3 

143.2 

46 

308.97 

298.35 

154.485 

149.175 

68.63 

98 

658.3 

635.6 

329.15 

317.8 

146.2 

47 

315.7 

304.83 

157.85 

152.415 

70.12 

100 

671.7 

648.6 

335.85 

324.3 

149.2 

Example:  Current  required  at  230  volts  to  transmit  75  horse-power. 

In  column  un- 

der 

1 230,  opposite  75 

in  the  Horse-power  columns, 

is  found  the  number  243.225,  which  is. 

the  required  number  of  amperes. 


Table  VIII. — Magnet  Wires  for  Electromagnets*  Field  Coils*  etc. 
Electrical  Properties. 


gS  Resistance  per  1000  feet  at 
•2  . Various  Temperatures. 

wffll00oF.  120°  F.  140°  F.  150°  F.  160°  F 

Current  required  to  give  the  Amperes  per  square 

inch  at  top  of  columns.  .2 03 

1000  1100  1200  1300  1400  1500  1600  1700  1800  “fq 

4 

.2659 

.2766 

.2875 

.2935 

.2995 

32.78 

36.06 

39.34 

42.62 

45.9 

49.18 

52.45 

55.73 

59.01 

4 

5 

.3353 

.3488 

.3625 

.3701 

.3776 

26. 

28.6 

31.2 

33.8 

36.4 

39. 

41.6 

44.2 

46.8 

5 

6 

.4229 

.4398 

.4571 

.4667 

.4762 

20.62 

22.68 

24.74 

26.80 

28.86 

30.92 

32.99 

35.05 

37.11 

6 

7 

.5332 

.5546 

.5764 

.588 

.6005 

16.35 

17.98 

19.62 

21.25 

22.89 

24.52 

26.16 

27.8 

29.43 

7 

8 

.6724 

.6993 

.7268 

.742 

.7572 

12.97 

14.26 

15.56 

16.86 

18.15 

19.45 

20.75 

22.04 

23.34 

8 

9 

.8477 

.8816 

.9164 

.9355 

.9546 

10.28 

11.31 

12.34 

13.37 

14.4 

15.43 

16.45 

17.48 

18.51 

9 

10 

1.0693 

1.1122 

1.156 

1.18 

1.2041 

8.15 

8.97 

9.78 

10.6 

11.41 

12.23 

13.05 

13.86 

14.67 

10 

11 

1.3481 

1.402 

1.4574 

1.4877 

1.5181 

6.47 

7.11 

7.76 

8.41 

9.05 

9.7 

10.35 

10.99 

11.64 

11 

12 

1.7 

1.768 

1.8378 

1.876 

1.9143 

5.13 

5.64 

6.15 

6.67 

7.18 

7.69 

8.21 

8.72 

9.23 

12 

13 

2.1436 

2.2295 

2.3173 

2.3655 

2.414 

4.07 

4.47 

4.88 

5.29 

5.69 

6.10 

6.51 

6.91 

7.32 

13 

14 

2.703 

2.811 

2.922 

2.983 

3.044 

3.15 

3.46 

3.78 

4.09 

4.41 

4.72 

5.03 

5.35 

5.66 

14 

15 

3.4085 

3.531 

3.685 

3.7615 

3.838 

2.56 

2.81 

3.07 

3.33 

3.58 

3.84 

4.09 

4.35 

4.60 

15 

IS 

4.286 

4.458 

4.633 

4.73 

4.8265 

2.03 

2.23 

2.43 

2.64 

2.84 

3.04 

3.25 

3.45 

3.65 

16 

17 

5.4195 

5.6365 

5.859 

5.981 

6.103 

1.61 

1.77 

1.93 

2.09 

2.25 

2.41 

2.57 

2.73 

2.9 

17 

18 

6.834 

7.108 

7.388 

7.542 

7.698 

1.28 

1.4 

1.53 

1.66 

1.79 

1.91 

2.04 

2.17 

2.3 

18 

19 

8.863 

9.218 

9.581 

9.781 

9.981 

.984 

1.082 

1.18 

1.279 

1.377 

1.475 

1.574 

1.672 

1.771 

19 

20 

10.866 

11.32 

11.748 

11.992 

12.237 

.802 

.882 

.962 

1.043 

1.143 

1.203 

1.284 

1.364 

1.444 

20 

21 

13.72 

14.251 

14.812 

15.121 

15.43 

.636 

.7 

.763 

.827 

.891 

.954 

1.018 

1.082 

1.145 

21 

22 

17.272 

17.963 

18.671 

19.06 

19.45 

.505 

.555 

.606 

.656 

.707 

.757 

.808 

.858 

.908 

22 

23 

21.79 

22.661 

23.555 

24.045 

24.536 

.4 

.44 

.48 

.52 

.56 

.6 

.64 

.68 

.72 

23 

24 

27.475 

28.575 

29.701 

30.32 

30.94 

.317 

.349 

.381 

.412 

.444 

.476 

.508 

.539 

.571 

24 

25 

34.645 

36.031 

37.451 

38.232 

39.013 

.252 

.277 

.302 

.327 

.352 

.377 

.403 

.428 

.453 

25 

26 

43.7 

45.45 

47.242 

48.226 

49.211 

.199 

,21j 

.239 

.259 

.279 

.299 

.319 

.339 

.359 

26 

Table  IX. — Magnet  Wires  for  Electromagnets,  Field  Coils*  etc. 

Mechanical  Data. 

The  letters  S.  C.  C.,  D.  C.  C.  and  T.  C.  C.  mean  single-cotton-covered,  double-cotton- 
covered  and  triple-cotton-covered. 


Proportion  of 


5?  Pounds  per 

* g feet* 

O.Q 

02  3 O d 

0 d 

02  Q 

T.  C.  C.  1 

Diameter  over  Number  of 
Insulation.  per  linear 

d d d d 

0 d d d ^ 

m A H d Q 

actual  copper 
turns  Layers  per  inch  in  coil  cross- 
inch. of  coil  depth.  section. 

1 

0 0 0 d 0 0 d ® 

d d d d d d d 1? 

EH  M A Eh  m Q Eh  O 

4 

128. 

128.38 

128.75 

.216 

.222 

.228 

4.63 

4.5 

4.38 

4.63 

4.51 

4.39 

.70 

.66 

.63 

4 

5 

101.65 

102.02 

102.39 

.194 

.200 

.206 

5.15 

5. 

4.85 

5.15 

5.01 

4.86 

.69 

.65 

.61 

5 

6 

80.7 

81.07 

81.44 

.172 

.177 

.182 

5.81 

5.65 

5.49 

5.82 

5.66 

5.5 

.70 

.66 

.62 

6 

7 

64.06 

64.43 

64.8 

.154 

.159 

.164 

6.49 

6.29 

6.1 

6.5 

6.3 

6.11 

.69 

.65 

.61 

7 

8 

50.82 

51.18 

51.54 

.138 

.143 

.148 

7.25 

7. 

6.76 

7.26 

7.01 

6.77 

.68 

.63 

.59 

8 

9 

40.32 

40.65 

40.97 

.123 

.127 

.131 

8.13 

7.87 

7.64 

8.14 

7.88 

7.66 

.69 

.64 

.60 

9 

10 

32. 

32.30 

32.62 

.109 

.113 

.116 

9.18 

8.85 

8.62 

9.2 

8.87 

8.65 

.69 

.64 

.60 

10 

11 

25.4 

25.70 

26. 

.097 

.100 

.103 

10.31 

10. 

9.7 

10.33 

10.03 

9.74 

.68 

.63 

.59 

11 

12 

20.2 

20.50 

20.8 

.087 

.091 

.095 

11.49 

10.99 

10.53 

11.52 

11.02 

10.57 

.67 

.62 

.58 

12 

13 

16.04 

16.36 

16.57 

.078 

.081 

.085 

12.S2 

12.35 

11.77 

12.85 

12.39 

11.82 

.78 

.63 

.59 

13 

11 

12.75 

13. 

13.25 

.070 

.073 

.076 

14.28 

13.7 

13.16 

14.3 

13.74 

13.21 

.66 

.61 

.56 

14 

15 

10.13 

10.33 

10.52 

.063 

.066 

.069 

15.87 

15.15 

14.49 

15.9 

15.2 

14.55 

.64 

.59 

.54 

15 

16 

8.05 

8.2 

8.37 

.057 

.060 

.063 

17.54 

16.66 

15.87 

17.57 

16.71 

15.93 

.63 

.57 

.52 

16 

17 

6.4 

6.55 

6.7 

.051 

.054 

.057 

19.61 

18.52 

17.55 

19.67 

18.6 

17.65 

.62 

.55 

.50 

17 

18 

5.09 

5.23 

5.37 

.046 

.049 

.052 

21.74 

20.41 

19.23 

21.81 

20.5 

19.35 

.60 

.53 

.47 

18 

19 

3.93 

4.07 

4.2 

.042 

.045 

.048 

23.81 

22.22 

20.83 

23.88 

22.32 

20.96 

.56 

.48 

.42 

19 

20 

3.216 

3.33 

3.45 

.0375 

.0405 

.043 

26.67 

24.69 

23.26 

26.75 

24.8 

23.4 

.57 

.49 

.43 

20 

21 

2.562 

2.68 

2.8 

.034 

.037 

.04 

29.41 

27.03 

25. 

29.5 

27.15 

25.15 

.55 

.46 

.40 

21 

22 

2.04 

2.15 

2.27 

.031 

.034 

.037 

32.26 

29.41 

27. 

32.39 

29.58 

27.22 

.53 

.44 

.37 

22 

23 

1.628 

1.72 

1.83 

.0275 

.0305 

.033 

36.36 

32.79 

30.3 

36.56 

32.99 

30.54 

.52 

.43 

.36 

23 

24 

1.303 

1.38 

1.47 

.025 

.0275 

.03 

40. 

36.36 

33.33 

40.16 

36.58 

33.57 

.51 

.42 

.35 

24 

25 

1.045 

1.12 

.023 

.0255 

43.48 

39.22 



43.66 

39.46 



.48 

.39 

25 

26 

.833 

.91 

.... 

.021 

.0235 

.... 

47.62 

42.55 

.... 

47.81 

42.81 

.45 

.36 

... 

26 

Table  X. — Magnet  Coils. 

Giving  the  mean  length  per  turn,  corresponding  to  a given  number  of  Ampere-turns, 
at  a constant  e.m.f.  of  1 volt  and  a temperature  of  150  degrees  Fahrenheit.  For 
other  voltages  multiply  the  constant  in  the  table  by  the  voltage  at  the  coil  ter- 
minals. For  other  temperatures  multiply  the  result  by  the  constant  in  the  aux- 
iliary  table.  


2d 
a)  a 
a 

Wire  Sizes;  B. 

and 

S.  Gauge. 

26 

25 

24 

23 

22 

21 

20 

19 

18 

17 

16 

1000 

.2488 

.3139 

.3958 

.5201 

.6296 

.7936 

1.0006 

1.2269 

1.5912 

2.0065 

2.537 

1100 

.2262 

.2853 

.3598 

.4537 

.5724 

.7215 

.9097 

1.1153 

1.4465 

1.824 

2.3065 

1200 

.2074 

.2616 

.3298 

.4159 

.5247 

.6614 

.8339 

1.0224 

1.326 

1.672 

2.1144 

1300 

.1914 

.2414 

.3044 

.3839 

.4843 

.6104 

.7697 

.9438 

1.224 

1.5435 

1.9516 

1400 

.1777 

.2242 

.2827 

.3565 

.4497 

.5668 

.7148 

.8764 

1.1365 

1.4332 

1.8122 

1500 

.1659 

.2092 

.2638 

.3327 

.4197 

.529 

.6671 

.8179 

1.0607 

1.3375 

1.6913 

1600 

.1555 

.1962 

.2473 

.3119 

.3935 

.4959 

.6254 

.7668 

.9944 

1.254 

1.5856 

1700 

.1464 

.1846 

.2328 

.2936 

.3703 

.4668 

.5886 

.7217 

.936 

1.1803 

1.4924 

1800 

.1382 

.1744 

.2199 

.2773 

.3497 

.4408 

.5559 

.6816 

.8839 

1.1146 

1.4095 

1900 

.131 

.1652 

.2083 

.2627 

.3314 

.4176 

.5266 

.6458 

.8374 

1.056 

1.3353 

2000 

.1244 

.1569 

.1979 

.2495 

.3148 

.3968 

.5003 

.6134 

.7956 

1.003 

1.2685 

2100 

.1185 

.14945 

.1885 

.2376 

.2998 

.3779 

.4765 

.5842 

.7577 

.9544 

1.208 

2200 

.1131 

.14266 

.1799 

.2268 

.2862 

.3607 

.4548 

.5577 

.7232 

.912 

1.1533 

2300 

.1082 

.13646 

.1721 

.217 

.2737 

.345 

.4351 

.5334 

.6918 

.8723 

1.103 

2400 

.1037 

.13078 

.1649 

.2079 

.2623 

.3306 

.4169 

.5112 

.663 

.836 

1.057 

2500 

.0945 

.12554 

.1583 

.1996 

.2518 

.3174 

.4002 

.4907 

.6364 

.8025 

1.0148 

2600 

.0957 

.12072 

.1522 

.192 

.2421 

.3052 

.3848 

.4718 

.612 

.7717 

.9758 

2700 

.0922 

.11625 

.1466 

.1848 

.2332 

.2939 

.3706 

.4544 

.5893 

.7431 

.9397 

2800 

.0889 

.1121 

.1413 

.1782 

.2248 

.2834 

.3573 

.4382 

.5682 

.7166 

.9061 

2900 

.0858 

.10823 

.1365 

.1721 

.2171 

.2736 

.345 

.4231 

.5486 

.6918 

.8748 

3000 

.0829 

.10462 

.1319 

.1664 

.2098 

.2645 

.3335 

.409 

.5304 

.6688 

.8456 

3100 

.0803 

.10125 

.1277 

.161 

.2031 

.256 

.3228 

.3958 

.5133 

.6472 

.8184 

3200 

.0777 

.09808 

.1237 

.156 

.1967 

.248 

.3127 

.3834 

.4972 

.627 

.7928 

3300 

.0754 

.09511 

.11993 

.1512 

.1908 

.2404 

.3032 

.3718 

.4822 

.608 

.7688 

3400 

.07319 

.09232 

.1164 

.1468 

.1852 

.2334 

.2943 

.3609 

.468 

.5901 

.7462 

3500 

.07109 

.08968 

.11307 

.1426 

.1799 

.2267 

.2859 

.3505 

.4546 

.5733 

.7249 

3600 

.06912 

.08719 

.10994 

.1386 

.1749 

.2204 

.2779 

.3408 

.442 

.5573 

.7047 

3700 

.06725 

.08483 

.10696 

.1349 

.1702 

.2145 

.2704 

.3316 

.43 

.5423 

.6857 

3800 

.06548 

.0826 

.10415 

.1313 

.1657 

.2088 

.2633 

.3229 

.4187 

.528 

.6677 

3900 

.0638 

.08048 

.10148 

.128 

.1614 

.2035 

.2566 

.3146 

.408 

.5145 

.6505 

4000 

.0622 

.0784 

.09894 

.1248 

.1574 

.1984 

.2501 

.3067 

.3978 

.5016 

.6343 

4100 

.0607 

.07655 

.09653 

.1217 

.1535 

.1935 

.2441 

.2992 

.3881 

.4894 

.6188 

4200 

.0592 

.07473 

.09422 

.1188 

.1499 

.1889 

.2382 

.2921 

.3788 

.4777 

.6041 

4300 

.0578 

.073 

.09203 

.116 

.1464 

.1845 

.2327 

.2853 

.37 

.4666 

.59 

4000 

.0622 

.07846 

.09894 

.1248 

.1574 

.1803 

.2274 

.2788 

.3616 

.456 

.5766 

4500 

.0553 

.0697 

.08794 

.1109 

.1399 

.1763 

.2223 

.2726 

.3536 

.4458 

.5638 

4600 

.0541 

.0682 

.08604 

.1085 

.1368 

.1725 

.2175 

.2667 

.3459 

.4362 

.5516 

4700 

.0529 

.06677 

.0842 

.1062 

.1339 

.1688 

.2129 

.261 

.3385 

.4269 

.5398 

4800 

.0518 

.06539 

.08245 

.104 

.1312 

.1653 

.2085 

.2556 

.3315 

.418 

.5286 

4900 

.0508 

.06405 

.08077 

.1018 

.1285 

.1619 

.2042 

.2504 

.3247 

.4095 

.5178 

5000 

.0497 

.06277 

.07915 

.0998 

.1259 

.1587 

.2001 

.2454 

.3182 

.4013 

.5074 

5200 

.0478 

.06036 

.07611 

.096 

.1211 

.1526 

.1924 

.2359 

.306 

.3858 

.4879 

5400 

.0461 

.05812 

.07329 

.0924 

.1166 

.1469 

.1853 

.2272 

.2946 

.3715 

.4698 

5600 

.0444 

.05604 

.07067 

.0891 

.1124 

.1417 

.1787 

.2191 

.2842 

.3583 

.453 

5800 

.0429 

.05412 

.06823 

.086 

.1085 

.1368 

.1725 

.2115 

.2743 

.3459 

.4374 

6000 

.0415 

.05231 

.06596 

.0832 

.1049 

.1322 

.1668 

.2045 

.2652 

.3344 

.4228 

6200 

.0401 

.05062 

.06383 

.0805 

.1015 

.128 

.1614 

.1979 

.2566 

.3236 

.4092 

6400 

.0389 

.04904 

.06184 

.078 

.0983 

.124 

.1563 

.1917 

.2486 

.3135 

.3964 

6600 

.0377 

.04755 

.05996 

.0756 

.0954 

.1202 

.1516 

.1859 

.2411 

.304 

.3844 

6800 

.0366 

.04615 

.0582 

.0734 

.0926 

.1167 

.1471 

.1804 

.234 

.295 

.3731 

7000 

.0355 

.04483 

.05656 

.0713 

.0899 

.1133 

.1429 

.1752 

.2273 

.2866 

.3624 

Table  XI. — Magnet  Cores. 

Correction  for  loss  of  cross-sectional  area  due  to  rounding  the  corners  of  rectangular 
cores.  Calculate  the  sectional  area  as  though  the  corners  were  left  sharp,  and  de- 
duct the  amount  given  in  the  table;  the  remainder  will  be  the  correct  area  of  the 
cross-section. 

Radius  of  arc  at  the  cor- 


ners   % % % % 11%  1%  1%  2 2%  3 

Deduct  0537  .12  .215  .483  .858  1.34  1.93  2.63  3.434  5.375  7.75 


Example;  A magnet  core  4x5  inches  has  corners  rounded  to  a radius  of  % inch.  The 
area  with  sharp  corners  would  be  4X5=20sq.  ins.  Deduct  0.483;  correct  area  = 19.52 
sq.  ins.  , 


Table  X. — Magnet  Coils.— Continued, 


15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3000 

1.0634 

1.341 

1.691 

2.132 

2.688 

3.389 

4.272 

5.39 

6.797 

8.571 

10.81 

13.63 

3100 

1.029 

1.2977 

1.636 

2.063 

2.602 

3.28 

4.134 

5.217 

6.578 

8.295 

10.46 

13.19 

3^00 

.997 

1.2572 

1.585 

1.999 

2.52 

3.178 

4.005 

5.054 

6.372 

8.036 

10.133 

12.778 

3300 

.9667 

1.219 

1.537 

1.938 

2.444 

3.081 

3.884 

4.9 

6.18 

7,792 

9.826 

12.39 

3400 

.9383 

1.1833 

1.449 

1.8275 

2.372 

2.991 

3.77 

4.756 

5.998 

7.563 

9.537 

12.026 

3500 

.9115 

1.1494 

1.449 

1.8275 

2.304 

2.905 

3.662 

4.62 

5.826 

7.347 

9.264 

11.682 

3600 

.8862 

1.1174 

1.409 

1.7767 

2.24 

2.825 

3.56 

4.492 

5.664 

7.143 

9.007 

11.358 

3700 

.8622 

1.0873 

1.371 

1.7288 

2.18 

2.748 

3.464 

4.371 

5.511 

6.95 

8.764 

11.051 

3800 

.8396 

1.0586 

1.335 

1.6832 

2.122 

2.676 

3.373 

4.256 

5.366 

6.767 

8.533 

10.76 

3900 

.818 

1.0315 

1.3006 

1.642 

2.068 

2.607 

3.286 

4.146 

5.229 

6.594 

8.315 

10.484 

4000 

.7976 

1.0056 

1.2682 

1.559 

2.016 

2.542 

3.204 

4.043 

5.098 

6.429 

8.107 

10.223 

4100 

.7781 

.9812 

1.2372 

1.561 

1.967 

2.48 

3.126 

3.944 

4.974 

6.272 

7.909 

9.973 

4200 

.7596 

.9578 

1.207 

1.523 

1.92 

2.421 

3.052 

3.85 

4.855 

6.123 

7.721 

9.736 

4300 

.742 

.9356 

1.1797 

1.4875 

1.876 

2.365 

2.98 

3.761 

4.742 

5.98 

7.541 

9.509 

4400 

.7251 

.9143 

1.1528 

1.4537 

1.833 

2.311 

2.913 

3.675 

4.634 

5.844 

7.369 

9.293 

4500 

.709 

.894 

1.1273 

1.4214 

1.792 

2.26 

2.848 

3.594 

4.531 

5.714 

7.206 

9.087 

4600 

.6935 

.8745 

1.1027 

1.3905 

1.753 

2.21 

2.786 

3.515 

4.433 

5.39 

7.049 

8.889 

4700 

.6788 

.8559 

1.0793 

1.361 

1.716 

2.163 

2.727 

3.441 

4.339 

5.471 

6.899 

8.7 

4800 

.6646 

.8381 

1.0568 

1.3326 

1.68 

2.118 

2.67 

3.369 

4.248 

5.357 

6.756 

8.519 

4900 

.6511 

.821 

1.0353 

1.3054 

1.646 

2.075 

2.615 

3.3 

4.161 

5.248 

6.617 

8.345 

5000 

.6381 

.8046 

1.0145 

1.2793 

1.613 

2.034 

2.563 

3.234 

4.078 

5.143 

6.485 

8.178 

5200 

.6135 

.7736 

.9755 

1.231 

1.551 

1.955 

2.465 

3.11 

3.921 

4.945 

6.236 

7.863 

5400 

.5908 

.745 

.9394 

1.1845 

1.494 

1.883 

2.373 

2.995 

3.776 

4.762 

6.005 

7.572 

5600 

.5697 

.7184 

.9058 

1.1423 

1.44 

1.816 

2.289 

2.888 

3.641 

4.592 

5.79 

7.302 

5800 

.55 

.6936 

.8746 

1.1028 

1.39 

1.753 

2.21 

2.788 

3.516 

4.433 

5.5591 

7.05 

6000 

.5317 

.6705 

.8454 

1.0661 

1.344 

1.695 

2.136 

2.695 

3.398 

4.286 

5.404 

6.815 

6250 

.5104 

.6437 

.8116 

1.0234 

1.29 

1.627 

2.051 

2.587 

3.263 

4.114 

5.188 

6.542 

6500 

.4908 

.6189 

.7804 

.9841 

1.241 

1.564 

1.972 

2.488 

3.137 

3.956 

4.989 

6.291 

6750 

.4726 

.596 

.7515 

.9477 

1.195 

1.506 

1.899 

2.396 

3.021 

3.81 

4.804 

6.058 

7000 

.4557 

.5747 

.7247 

.9138 

1.152 

1.453 

1.831 

2.31 

2.913 

3.673 

4.632 

5.841 

7250 

.44 

.5549 

.6997 

.8823 

1.112 

1.402 

1.768 

2.23 

2.813 

3.547 

4.473 

5.64 

7500 

.4254 

.5364 

.6764 

.8529 

1.075 

1.356 

1.709 

2.156 

2.719 

3.428 

4.323 

5.452 

7750 

.4116 

.5191 

.6546 

.8253 

1.041 

1.312 

1.654 

2.086 

2.631 

3.318 

4.184 

5.276 

8000 

.3988 

.5029 

.6341 

.7996 

1.008 

1.271 

1.602 

2.021 

2.549 

3.214 

4.053 

5.111 

8250 

.3867 

.49 

.6149 

.7753 

.9776 

1.232 

1.553 

1.96 

2.471 

3.117 

3.93 

4.956 

8500 

.3753 

.4733 

.5968 

.7525 

.949 

1.196 

1.508 

1.902 

2.399 

3.025 

3.815 

4.811 

8750 

.3646 

.4598 

.5798 

.731 

.9218 

1.162 

1.465 

1.848 

2.33 

2.939 

3.706 

4.673 

9000 

.3545 

.447 

.5636 

.7107 

.8962 

1.13 

1.424 

1.797 

2.266 

2.857 

3.603 

4.543 

9250 

.3449 

.4349 

.5484 

.6915 

.872 

1.099 

1.391 

1.748 

2.204 

2.78 

3.505 

4.42 

9500 

.3369 

.4234 

.534 

.6733 

.849 

1.07 

1.349 

1.702 

2.146 

2.707 

3.413 

4.304 

9750 

.3272 

.4126 

.5203 

.656 

.8273 

1.043 

1.314 

1.658 

2.091 

2.637 

3.326 

4.194 

10000 

.319 

.4023 

.5073 

.6396 

.8066 

1.017 

1.282 

1.617 

2.039 

2.571 

3.243 

4.089 

Correction  Table  for  Other 

Temperatures. 

Temperature  

120° 

140° 

160° 

Multiplier  

906 

.943 

.98 

1.02 

Example:  A magnet  requires  3200  ampere-turns;  the  mean  length  per  turn  may  be 
from  19  to  20  inches;  the  voltage  is  50.  To  reduce  to  mean  length  of  the  coil  to  mean 
length  per  volt,  divide  by  50;  result,  .38  to  .4.  In  the  table,  opposite  3200  ampere-turns, 
the  nearest  number  is  .3834,  and  this  is  in  No.  18  column.  The  wire  will  be  No.  18,  there- 
fore, and  the  corrected  mean  length  .3834  X 50  = 19.17  inches. 

Example  II.— Conditions  as  above,  but  desired  temperature  100°  F.  instead  of  150°. 
The  mean  length  obtained  above  was  19.17  inches;  multiply  this  by  .906;  result,  17.37 
inches.  But  it  was  desired  to  have  between  19  and  20  inches;  to  find  nearest  table 
number,  divide  19  or  20— say  19^— by  the  multiplier,  .906.  19.5-^.906  = 21.52  inches;  di- 
vide by  50  volts  for  ampere-turns  per  volt  = .4304.  The  nearest  numbers  opposite  3200 
are  .3834  and  .4972;  the  former  was  tried  first  and  found  too  small.  50  X .4972  = 24.43 
inches,  so  that  the  choice  must  lie  between  this  and  17.37  inches  first  obtained. 


Table  XII-A. — Steam  Engine  Capacity, 


Diam.  Horse  Power  Developed.- 


3 

1.6 

1.74 

1.87 

2.01 

2.14 

2.27 

2.41 

2.54 

2.67 

2.81 

2.94 

3.08 

3% 

1.88 

2.04 

2.2 

2.35 

2.51 

2.67 

2.83 

2.98 

3.14 

3.3 

3.45 

3.61 

3V2 

2.19 

2.37 

2.55 

2.73 

2.91 

3.1 

3.28 

3.46 

3.63 

3.83 

4.01 

4.19 

3% 

2.51 

2.74 

2.93 

3.14 

3.34 

3.55 

3.76 

3.97 

4.18 

4.39 

4.6 

4.81 

4 

2.85 

3.09 

3.33 

3.57 

3.81 

4.04 

4.28 

4.52 

4.76 

4.97 

5.24 

5.47 

4& 

3.22 

3.49 

3.76 

4.03 

4.3 

4.57 

4.84 

5.1 

5.37 

5.64 

5.91 

6.18 

4% 

3.61 

3.91 

4.22 

4.52 

4.82 

5.12 

5.42 

5.72 

6.02 

6.32 

6.63 

6.93 

4% 

4.03 

4.36 

4.7 

5.03 

5.37 

5.7 

6.04 

6.38 

6.71 

7.05 

7.38 

7.72 

5 

4.46 

4.83 

5.2 

5.58 

5.95 

6.32 

6.69 

7.06 

7.44 

7.81 

8.18 

8.55 

5y2 

5.4 

5.85 

6.3 

6.75 

7.2 

7.65 

8.1 

8.55 

9. 

9.45 

9.9 

10.35 

6 

6.42 

6.96 

7.49 

8.03 

8.56 

9.1 

9.64 

10.17 

10.71 

11.24 

11.78 

12.31 

eya 

7.54 

8.17 

8.8 

9.42 

10.05 

10.68 

11.31 

11.94 

12.57 

13.2 

13.82 

14.45 

7 

8.75 

9.48 

10.21 

10.94 

11.66 

12.39 

13.12 

13.85 

14.58 

15.31 

16.04 

16.77 

7y2 

10.04 

10.88 

11.71 

12.55 

13.38 

14.22 

15.06 

15.9 

16.73 

17.57 

18.4 

19.24 

8 

11.42 

12.38 

13.33 

14.28 

15.23 

16.18 

17.14 

18.09 

19.04 

19.99 

20.95 

21.9 

8 y2 

12.9 

13.97 

15.05 

16.12 

17.2 

18.27 

19.35 

20.42 

21.5 

22.57 

23.65 

24.72 

9 

14.46 

15.66 

16.87 

18.07 

19.28 

20.48 

21.69 

22.89 

24.1 

25.3 

26.51 

27.71 

9y2 

16.11 

17.45 

18.79 

20.14 

21.48 

22.82 

24.16 

25.51 

26.85 

28.19 

29.53 

30.88 

10 

17.85 

19.34 

20.82 

22.31 

23.8 

25.29 

26.76 

28.26 

29.75 

31.24 

32.72 

34.21 

11 

21.6 

23.4 

25.2 

27. 

28.8 

30.6 

32.4 

34.2 

36. 

37.8 

39.6 

41.4 

12 

25.7 

27.85 

29.99 

32.13 

34.27 

36.42 

38.56 

40.7 

42.84 

44.98 

47.13 

49.27 

13 

30.16 

32.68 

35.19 

37.71 

40.22 

42.73 

45.25 

47.76 

50.28 

52.79 

55.3 

57.82 

14 

35. 

37.91 

40.83 

43.75 

46.67 

49.58 

52.5 

55.42 

58.33 

61.25 

64.17 

67.08 

15 

40.16 

43.51 

46.86 

50.2 

53.55 

56.9 

60.24 

63.59 

66.94 

70.29 

73.63 

76.98 

1G 

45.69 

49.5 

53.31 

57.12 

60.92 

64.74 

68.54 

72.35 

76.16 

79.97 

83.77 

87.58 

18 

57.83 

62.65 

67.48 

72.29 

77.11 

81.93 

86.75 

91.57 

96.29 

101.2 

106. 

110.8 

20 

71.4 

77.35 

83.3 

89.25 

95.2 

101.1 

107.1 

113. 

119. 

125. 

130.9 

136.8 

h 

H 

S 

Stroke  in 

inches, 

multiplied  by 

Revolutions 

per  minute. 

25 

1800 

1950 

2100 

2250 

2400 

2550 

2700 

2850 

3000 

3150 

3300 

3450 

2S 

1731 

1875 

2019 

2164 

2308 

2452 

2596 

2740 

2885 

3029 

3173 

3317 

27 

1667 

1806 

1945 

2083 

2222 

2361 

2500 

2639 

2778 

2917 

3056 

3195 

28 

1607 

1741 

1875 

2009 

2143 

2277 

2411 

2545 

2679 

2812 

2946 

3080 

29 

1552 

1681 

1811 

1940 

2069 

2198 

2328 

2457 

2586 

2716 

2845 

2974 

30 

1500 

1625 

1750 

1875 

2000 

2125 

2250 

2375 

2500 

2625 

2750 

2875 

31 

1452 

1573 

1694 

1815 

1935 

2057 

2177 

2298 

2419 

2540 

2661 

2782 

32 

1406 

1523 

1641 

1758 

1875 

1992 

2109 

2227 

2344 

2461 

2578 

2695 

33 

1364 

1477 

1591 

1705 

1818 

1932 

2045 

2159 

2273 

2386 

2500 

2614 

34 

1323 

1434 

1544 

1654 

1765 

1875 

1985 

2096 

2206 

2316 

2426 

2537 

35 

1286 

1393 

1500 

1607 

1714 

1821 

1929 

2036 

2143 

2250 

2357 

2464 

36 

1250 

1354 

1458 

1563 

1667 

1771 

1875 

1979 

2083 

2188 

2292 

2396 

37 

1216 

1318 

1419 

1520 

1662 

1723 

1824 

1926 

2027 

2128 

2230 

2331 

38 

1184 

1283 

1382 

1480 

1579 

1678 

1776 

1875 

1974 

2073 

2171 

2270 

39 

1154 

1250 

1346 

1442 

1539 

1635 

1731 

1827 

1923 

2019 

2115 

2212 

40 

1125 

1219 

1313 

1406 

1500 

1594 

1688 

1781 

1875 

1969 

2063 

2156 

42 

1072 

1161 

1250 

1339 

1429 

1517 

1607 

1696 

1786 

1875 

1964 

2054 

44 

1023 

1108 

1193 

1278 

1364 

1449 

1534 

1619 

1706 

1790 

1875 

1960 

46 

978 

1060 

1142 

1223 

1304 

1386 

1468 

1549 

1630 

1712 

1794 

1875 

48 

938 

1016 

1094 

1172 

1250 

1328 

1406 

1484 

1563 

1641 

1719 

1797 

50 

900 

975 

1050 

1125 

1200 

1275 

1350 

1425 

1500 

1575 

1650 

1725 

Figures  in  upper  section,  except  the  first  column,  are  Horse-power;  those  in  lower 
section,  except  the  first  column,  are  Stroke  X r.p.m. 

Example:  Mean  effective  pressure  = 33  lbs.;  stroke  (10  ins.)  X r.p.m.(250)  = 2500;  diame- 
ter of  cylinder  = 8 ins.;  what  is  the  horse-power?  Trace  horizontally  from  33,  in  M. 
E.  P.  column,  until  2500  is  reached;  thence  upward  into  upper  section  to  the  number 
horizontally  opposite  the  diameter.  8;  this  number,  20.95,  is  the  horse-power.  For  sizes 
beyond  the  range  of  this  table  use  Table  XII-B. 


t 


Table  XII-B. — Steam  Engine  Capacity. 


•5  x Horse-Power  Developed.- 

Q 


6 

10.71 

11.42 

12.14 

12.85 

13.57 

14.28 

14.99 

15.71 

16.42 

17.13 

17.85 

18.56 

6V2  12.57 

13.41 

14.24 

15.08 

15.92 

16.76 

17.6 

18.43 

19.27 

20.11 

20.95 

21.79 

7 

14.58 

15.55 

16.52 

16.99 

18.46 

19.44 

20.41 

21.38 

22.35 

23.32 

24.29 

25.27 

7VZ  16.73 

17.85 

18.96 

20.08 

21.19 

22.31 

23.43 

24.54 

25.65 

26.77 

27.87 

29. 

8 

19.04 

20.31 

21.58 

22.85 

24.12 

25.37 

26.65 

27.92 

29.2 

30.45 

31.72 

33. 

9 

24.07 

25.7 

27.3 

28.9 

30.52 

32.12 

33.72 

35.35 

36.95 

38.55 

40.15 

41.75 

10 

29.75 

31.73 

33.72 

35.7 

37.68 

39.67 

41.65 

43.63 

45.62 

47.6 

49.58 

51.57 

11 

36. 

38.4 

40.8 

43.2 

45.6 

48. 

50.4 

52.8 

55.2 

57.6 

60. 

62.4 

12 

42.84 

45.69 

48.55 

51.4 

54.27 

57.12 

59.98 

62.83 

65.69 

68.54 

71.4 

74.25 

13 

50.28 

53.63 

56.98 

60.34 

63.69 

67.04 

70.39 

73.74 

77.09 

80.44 

83.8 

87.15 

14 

58.33 

62.2 

66.08 

69.97 

73.86 

77.75 

81.64 

85.52 

89.41 

93.29 

97.18 

101.1 

15 

66.94 

71.4 

75.86 

80.32 

84.78 

89.25 

93.71 

98.17 

102.6 

107.1 

111.5 

116. 

16 

76.16 

81.24 

86.31 

91.39 

96.47 

101.5 

106.6 

111.7 

116.8 

121.8 

126.9 

132. 

18 

96.29 

102.8 

109.2 

115.6 

122.1 

128.5 

134.9 

141.4 

147.8 

154.2 

160.6 

167. 

20 

119. 

126.9 

134.8 

142.8 

150.7 

158.6 

166.6 

174.5 

182.5 

190.4 

198.3 

206.3 

22 

144. 

153.6 

163.2 

172.8 

182.4 

192. 

201.6 

211.2 

220.8 

230.4 

240. 

249.6 

24 

166.3 

177.4 

188.5 

199.6 

210.7 

221.8 

232.9 

244. 

255.1 

266.2 

277.2 

288.3 

26 

201.1 

214.5 

227.9 

241.3 

254.7 

268.1 

281.5 

294.9 

308.3 

321.7 

335.2 

348.6 

28 

233.2 

248.8 

264.3 

279.8 

295.4 

311. 

326.5 

342.1 

357.6 

373.2 

388.7 

404.3 

30 

267.7 

285.6 

303.4 

321.3 

339.1 

357. 

374.8 

392.7 

410.5 

428.4 

446.2 

464.1 

32 

304.6 

324.9 

345.2 

365.5 

385.9 

406.2 

426.5 

446.8 

467.1 

487.4 

507.7 

528. 

34 

343.9 

366.8 

389.7 

412.7 

435.6 

458.5 

481.4 

504.4 

527.3 

550.2 

573.2 

596. 

36 

385.5 

411.2 

436.9 

462.6 

488.3 

514. 

539.8 

565.4 

591.1 

616.8 

642.6 

668.2 

38 

429.6 

458.2 

486.9 

515.5 

544.1 

572.8 

601.4 

630. 

658.7 

687.4 

716. 

744.6 

40 

476. 

507.6 

539.2 

571.2 

602.8 

634.4 

666.6 

698. 

730. 

761.6 

793.2 

825.2 

42 

524.8 

559.7 

594.8 

629.7 

664.7 

699.8 

734.7 

769.7 

804.7 

839.7 

874.6 

909.7 

44 

576. 

614.4 

652.8 

691.2 

729.6 

768. 

806.4 

844.8 

883.2 

921.6 

960. 

998.4 

46 

629.5 

671.4 

713.5 

755.4 

797.3 

839.4 

881.3 

923.2 

965.3 

1007. 

1049. 

1091. 

48 

665.2 

709.6 

754. 

798.4 

842.8 

885.2 

931.6 

976. 

1020. 

1065. 

1109. 

1153. 

p; 

H 

Stroke  in  Inches 

Multiplied  by  Revolutions  per  Minute. 

a 

25 

3000 

3200 

3400 

3600 

3800 

4000 

4200 

4400 

4600 

4800 

5000 

5200 

26 

2885 

3077 

3269 

3462 

3654 

3847 

4039 

4231 

4423 

4615 

4808 

5000 

27 

2778 

2963 

3148 

3333 

3519 

3704 

3889 

4074 

4259 

4445 

4630 

4815 

28 

2679 

2857 

3036 

3214 

3393 

3572 

3750 

3929 

4107 

4286 

4464 

4643 

29 

2586 

2759 

2931 

3104 

3276 

3448 

3621 

3793 

3966 

4138 

4311 

4483 

30 

2500 

2667 

2833 

3000 

3167 

3333 

3500 

3667 

3833 

4000 

4167 

4334 

31 

2419 

2581 

2742 

2903 

3065 

3226 

3387 

3548 

3710 

3871 

4032 

4193 

32 

2344 

2500 

2656 

2813 

2969 

3125 

3281 

3438 

3594 

3750 

3907 

4063 

33 

2273 

2424 

2576 

2727 

2879 

3030 

3182 

3333 

3485 

3636 

3788 

3939 

34 

2206 

2353 

2500 

2647 

2794 

2941 

3088 

3235 

3382 

3530 

3677 

3824 

35 

2143 

2286 

2429 

2571 

2714 

2857 

3000 

3143 

3286 

3429 

3572 

3714 

36 

2084 

2222 

2361 

2500 

2639 

2778 

2917 

3056 

3195 

3334 

3472 

3611 

37 

2027 

2162 

2297 

2432 

2568 

2703 

2838 

2973 

3108 

3243 

3378 

3514 

38 

1974 

2105 

2237 

2369 

2500 

2632 

2763 

2895 

3026 

3158 

3290 

3421 

39 

1923 

2051 

2180 

2308 

2436 

2564 

2692 

2820 

2949 

3077 

3205 

3333 

40 

1875 

2000 

2125 

2250 

2375 

2500 

2625 

2750 

2875 

3000 

3125 

3250 

42 

1786 

1905 

2024 

2143 

2262 

2381 

2500 

2619 

2738 

2857 

2976 

3095 

44 

1705 

1818 

1932 

2046 

2159 

2273 

2386 

2500 

2614 

2727 

2841 

2955 

46 

1631 

1739 

1848 

1957 

2065 

2174 

2283 

2391 

2500 

2609 

2718 

2826 

48 

1563 

1667 

1771 

1875 

1979 

2083 

2188 

2292 

2396 

2500 

2604 

2708 

50 

1500 

1600 

1700 

1800 

1900 

2000 

2100 

2200 

2300 

2400 

2500 

2600 

Figures  in  upper  sections,  except  first  column,  are  Horse-power;  those  in  lower  sec- 
tion, except  first  column,  are  Stroke  X r.p.m. 

Example:  Mean  effective  pressure  = 36;  Stroke  = 18  ins.;  R.p.m.  = 200;  Diameter  = 16 
ins.  What  is  the  horse-power?  Stroke  X r.p.m.  3600;  find  the  number  nearest  this 
horizontally  in  line  with  the  M.  E.  P.  of  36;  it  is  3611.  Trace  upward  until  the  number 
opposite  the  cylinder  diameter  (16)  is  reached;  this  number  (132)  is  the  horse-power. 

For  sizes  beyond  range  of  table,  take  one-half  of  any  factor,  except  diameter,  and 
multiply  the  result  by  2;  for  large  diameters,  take  one-half  the  actual  diameter  and 
multiply  result  by  4. 

0 


Table  XIII.— Engine  and  Generator  Ratios. 

The  figures  in  the  body  of  the  table  are  ratios  of  indicated  horse-power  in  engine  cyl- 
inder to  output  in  kilowatts  at  the  generator  terminals. 


is 

ctf  <y 

eg 

75  76 


77 


78 


79 


Engine  Efficiency. 

0 81  82  83  84  85 


87 


88 


90 


75 

2.38 

2.35 

2.32 

76 

2.35 

2.32 

2.29 

77 

2.32 

2.29 

2.26 

7S 

2.29 

2.26 

2.23 

79 

2.26 

2.23 

2.2 

80 

2.23 

2.2 

2.18 

81 

2.21 

2.18 

2.15 

82 

2.18 

2.15 

2.12 

83 

2.15 

2.13 

2.1 

84 

2.13 

2.1 

2.07 

85 

2.1 

2.08 

2.05 

86 

2.08 

2.05 

2.03 

87 

2.06 

2.03 

2. 

88 

2.03 

2.01 

1.98 

89 

2.01 

1.98 

1.96 

90 

1.99 

1.96 

1.94 

91 

1.97 

1.94 

1.92 

92 

1.95 

1.92 

1.89 

93 

1.92 

1.9 

1.87 

94 

1.9 

1.88 

1.85 

95 

1.88 

1.86 

1.83 

96 

1.86 

1.84 

1.82 

2.29 

2.26 

2.23 

2.21 

2.26 

2.23 

2.20 

2.18 

2.23 

2.2 

2.18 

2.15 

2.2 

2.17 

2.15 

2.12 

2.18 

2.15 

2.12 

2.09 

2.15 

2.12 

2.09 

2.07 

2.12 

2.1 

2.07 

2.04 

2.1 

2.07 

2.04 

2.02 

2.07 

2.05 

2.02 

2. 

2.05 

2.02 

2. 

1.97 

2.02 

2. 

1.97 

1.95 

2. 

1.97 

1.95 

1.93 

1.98 

1.95 

1.93 

1.9 

1.96 

1.93 

1.91 

1.88 

1.93 

1.91 

1.88 

1.S6 

1.91 

1.89 

1.86 

1.84 

1.89 

1.87 

1.84 

1.82 

1.87 

1.85 

1.82 

1.8 

1.85 

1.83 

1.8 

1.78 

1.83 

1.81 

1.78 

1.76 

1.81 

1.79 

1.77 

1.74 

1.79 

1.77 

1.75 

1.73 

2.18 

2.15 

2.13 

2.10 

2.15 

2.12 

2.10 

2.07 

2.12 

2.1 

2.07 

2.05 

2.1 

2.07 

2.05 

2.02 

2.07 

2.04 

2.02 

2. 

2.04 

2.02 

1.99 

1.97 

2.02 

2. 

1.97 

1.95 

1.99 

1.97 

1.95 

i.y2 

1.97 

1.95 

1.92 

1.9 

1.95 

1.92 

1.9 

1.88 

1.92 

1.9 

1.88 

1.86 

1.9 

1.88 

1.86 

1.84 

1.88 

1.86 

1.84 

1.81 

1.86 

1.84 

1.81 

1.79 

1.84 

1.82 

1.79 

1.77 

1.82 

1.8 

1.77 

1.75 

1.8 

1.78 

1.76 

1.74 

1.78 

1.76 

1.74 

1.72 

1.76 

1.74 

1.72 

1.7 

1.74 

1.72 

1.7 

1.68 

1.72 

1.7 

1.68 

1.66 

1.7 

1.68 

1.66 

1.64 

2.08 

2.05 

2.03 

1.99 

2.05 

2.03 

2. 

1.96 

2.02 

2. 

1.98 

1.94 

2. 

1.97 

1.95 

1.91 

1.97 

1.95 

1.93 

1.89 

1.95 

1.93 

1.9 

1.86 

1.93 

L9 

1.86 

1.84 

i.y 

1.88 

1.86 

1.82 

1.88 

1.86 

1.84 

1.8 

1.86 

1.84 

1.81 

1.78 

1.84 

1.81 

1.79 

1.75 

1.81 

1.79 

1.77 

1.73 

1.79 

1.77 

1.75 

1.71 

1.77 

1.75 

1.73 

1.69 

1.75 

1.73 

1.71 

1.68 

1.73 

1.71 

1.69 

1.66 

1.72 

1.7 

1.68 

1.64 

1.7 

1.68 

1.66 

1.62 

1.68 

1.66 

1.64 

1.6 

1.66 

1.64 

1.62 

1.59 

1.64 

1.62 

1.6 

1.57 

1.63 

1.61 

1.59 

1.55 

Table  XIV.— Boiler  Output. 

Required  Hourly  Evaporation  per  Commercial  Horse-Power  at  Various  Temperatures 
of  Feed  and  Pressures  of  Steam. 


Temp. 

feedwa 

80 

90 

100 

Steam  Pressure  in  Pounds  by  Gauge. 

110  120  130  140  150  160  170 

180 

190 

200 

Temp. 

feedwa 

60 

28.89 

28.84 

28.79 

28.74 

28.69 

28.65 

28.61 

28.57 

28.54 

28.51 

28.48 

28.45 

28.42 

60 

70 

29.15 

29.09 

29.04 

28.99 

28.94 

28.90 

28.86 

28.82 

28.78 

28.75 

28.72 

28.69 

28.66 

70 

80 

29.40 

29.34 

29.29 

29.24 

29.19 

29.15 

29.11 

29.07 

29.03 

29.00 

28.97 

28.94 

28.91 

80 

90 

29.67 

29.61 

29.55 

29.50 

29.45 

29.41 

29.37 

29.33 

29.29 

29.25 

29.22 

29.19 

29.16 

90 

100 

29.93 

29.87 

29.82 

29.77 

29.72 

29.67 

29.63 

29.59 

29.55 

29.51 

29.48 

29.45 

29.42 

100 

110 

30.20 

30.14 

30.09 

30.04 

29.99 

29.94 

29.90 

29.86 

29.82 

29.78 

29.74 

29.71 

29.68 

110 

120 

30.48 

30.42 

30.36 

30.31 

30.26 

30.21 

30.17 

30.13 

30.09 

30.05 

30.01 

29.98 

29.95 

120 

130 

30.76 

30.70 

30.65 

30.59 

30.54 

30.50 

30.45 

30.41 

30.37 

30.33 

30.29 

30.25 

30.22 

130 

140 

31.05 

30.99 

30.93 

30.88 

30.83 

30.78 

30.73 

30.69 

30.65 

30.61 

30.57 

30.53 

30.50 

140 

150 

31.35 

31.28 

31.22 

31.17 

31.12 

31.07 

31.02 

30.97 

30.93 

30.89 

30.85 

30.81 

30.78 

150 

160 

31.65 

31.58 

31.52 

31.46 

31.41 

31.36 

31.31 

31.27 

31.23 

31.19 

31.15 

31.11 

31.08 

160 

170 

31.96 

31.89 

31.83 

31.77 

31.71 

31.66 

31.61 

31.56 

31.52 

31.48 

31.44 

31.40 

31.37 

170 

180 

32.27 

32.20 

32.14 

32.08 

32.02 

31.97 

31.92 

31.87 

31.83 

31.79 

31.75 

31.71 

31.67 

180 

190 

32.59 

32.52 

32.45 

32.39 

32.33 

32.28 

32.23 

32.18 

32.14 

32.10 

32.06 

32.02 

31.98 

190 

2u0 

32.91 

32.84 

32.77 

32.71 

32.65 

32.60 

32.55 

32.50 

32.45 

32.41 

32.37 

32.33 

32.29 

200 

212 

33.31 

33.24 

33.17 

33.U 

33.05 

32.99 

32.94 

32.89 

32.84 

32.80 

32.76 

32.72 

32.68 

212 

The  above  table  is  based  on  the  standard  rating  of  30  lbs.  of  water  per  horse-power 
hour,  evaporated  from  feed  water  at  100°  F.  into  steam  at  70  lbs.  gauge  pressure,  which 
was  recommended  by  the  Committee  of  the  American  Society  of  Mechanical  Engineers. 
The  figures  in  the  body  of  the  table  give  the  number  of  pounds  of  water  which  must 
be  evaporated  per  horse-power  hour  at  other  temperatures  and  pressures  in  order  to 
conform  to  this  method  of  rating. 


Table  XV.— Belt  Horse-Power. 

Horse-Power  of  a Double  Leather  Belt  Per  Inch  of  Width. 
Computed  by  A.  F.  Nagle’s  Formula. 


Velocity  in 
ft.  per  sec. 

1/3 

% 

7/16 

15 

2.58 

2.91 

3.39 

3.87 

20 

3.42 

3.85 

4.49 

5.13 

25 

4.25 

4.78 

5.57 

6.37 

30 

5.05 

5.67 

6.62 

7.58 

35 

5.83 

6.56 

7.65 

8.75 

40 

6.60 

7.42 

8.66 

9.90 

45 

7.32 

8.43 

9.70 

10.98 

50 

8.02 

9.02 

10.52 

12.03 

55 

8.66 

9.74 

11.36 

13.00 

60 

9.28 

10.43 

12.17 

13.91 

65 

9.83 

11.06 

12.90 

14.75 

70 

10.33 

11.62 

13.56 

15.50 

75 

10.84 

12.16 

14.18 

16.21 

80 

11.21 

12.61 

14.71 

16.81 

85 

11.55 

13.00 

15.16 

17.32 

90 

11.80 

13.27 

15.48 

17.69 

100 

12.13 

13.65 

15.92 

18.20 

The  H.P.  becomes  a maximum  at  105.4  ft.  per  sec.  = 6324  ft.  per  min. 

In  the  above  table  the  arc  of  contact  is  taken  at  180°. 

For  an  arc  of 90°  100°  110°  120°  130°  140°  150°  160°  170°  180°  200° 

Multiply  above  values  by 65  .70  .75  .79  .83  .87  .91  .94  .97  1 1.05 


Table  XVI. — Belt  and  Pulley  Speeds. 

Pulley  Revolutions  per  Minute  Corresponding  to  Various  Belt  Speeds. 


Belt  Speed  in  Feet  per  Second. 


Q 

20 

25 

30 

35 

40 

45 

50 

55 

60 

65 

70 

75 

80 

85 

90 

95 

100 

3 

1528 

1910 

2292 

2674 

3056 

3438 

3820 

3% 

1310 

1637 

1965 

2292 

2619 

2947 

3274 

3602 

3929 

4256 

4 

1146 

1432 

1719 

2005 

2292 

2578 

2865 

3151 

3438 

3724 

40li 

4V2 

1019 

1273 

1528 

1783 

2037 

2292 

2547 

2801 

3056 

3311 

3565 

3820 

4075 

5 

917 

1146 

1375 

1604 

1833 

2063 

2292 

2521 

2750 

2979 

3209 

3438 

3667 

3896 

.... 

sy2 

833 

1042 

1250 

1458 

1667 

1875 

2084 

2292 

2500 

2709 

2917 

3125 

3334 

3542 

3750 

3959 

6 

764 

955 

1146 

1337 

1528 

1719 

1910 

2101 

2292 

2483 

2674 

2865 

3056 

3247 

3438 

3629 

3820 

6y2 

705 

882 

1058 

1234 

1410 

1587 

1763 

1939 

2116 

2292 

2468 

2645 

2821 

2997 

3173 

3350 

3526 

7 

655 

818 

982 

1146 

1310 

1473 

1637 

1801 

1965 

2128 

2292 

2456 

2619 

2783 

2947 

3110 

3274 

7 V2 

611 

764 

917 

1070 

1222 

1375 

1528 

1681 

1833 

1986 

2139 

2292 

2445 

2597 

2750 

2903 

3056 

8 

573 

716 

859 

1003 

1146 

1289 

1432 

1576 

1719 

1862 

2005 

2149 

2292 

2435 

2578 

2721 

2865 

8y2 

539 

674 

809 

944 

1079 

1213 

1348 

1483 

1618 

1753 

1888 

2022 

2157 

2292 

2427 

2561 

2686 

9 

509 

637 

764 

891 

1019 

1146 

1273 

1401 

1528 

1655 

1783 

1910 

2037 

2165 

2292 

2419 

2526 

10 

573 

688 

802 

917 

1031 

1146 

1260 

1375 

1490 

1604 

1719 

1833 

1948 

2063 

2177 

2292 

11 

521 

625 

729 

833 

938 

1042 

1146 

1250 

1354 

1459 

1563 

1667 

1771 

1875 

1979 

2083 

12 

477 

573 

668 

764 

859 

955 

1050 

1146 

1241 

1337 

1432 

1528 

1623 

1719 

1814 

1910 

13 

529 

617 

705 

793 

881 

970 

1058 

1146 

1234 

1322 

1410 

1498 

1587 

1675 

1763 

14 

491 

573 

655 

737 

818 

900 

982 

1064 

1146 

1228 

1310 

1391 

1473 

1555 

1637 

15 

535 

611 

687 

764 

840 

917 

993 

1070 

1146 

1222 

1299 

1375 

1451 

1528 

16 

501 

573 

644 

716 

788 

859 

931 

1003 

1074 

1146 

1218 

1289 

1361 

1432 

17 

472 

539 

607 

674 

741 

809 

876 

944 

1011 

1078 

1146 

1213 

1281 

1348 

18 

509 

573 

637 

700 

764 

828 

891 

955 

1019 

1082 

1146 

1210 

1273 

20 

458 

516 

573 

630 

687 

745 

802 

859 

917 

974 

1031 

1089 

1146 

21 

437 

491 

546 

600 

655 

709 

764 

818 

873 

928 

982 

1037 

1091 

22 

416 

469 

521 

573 

625 

677 

729 

781 

833 

885 

937 

989 

1042 

23 

398 

448 

498 

548 

598 

648 

697 

747 

797 

847 

897 

947 

996 

24 

382 

430 

477 

525 

573 

621 

668 

716 

764 

812 

859 

907 

955 

25 

412 

458 

504 

550 

596 

642 

687 

733 

779 

825 

871 

917 

26 

440 

485 

529 

573 

617 

661 

705 

749 

793 

837 

881 

27 

... 

424 

467 

509 

552 

594 

637 

679 

721 

764 

806 

849 

28 

409 

450 

491 

532 

573 

614 

655 

696 

737 

777 

818 

30 

. . . 

382 

420 

458 

496 

535 

573 

611 

649 

687 

726 

764 

32 

358 

394 

430 

465 

501 

537 

573 

609 

644 

680 

716 

34 

337 

371 

404 

438 

472 

505 

539 

573 

607 

640 

674 

36 

318 

350 

382 

414 

445 

477 

509 

541 

573 

605 

637 

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Table  XVIII. 

Theoretical  Horse-Power  Required  to  Raise  Water  to  Different  Heights. 
The  Figures  at  Top  of  Columns  are  Height  in  Feet. 


GSls. 

per 

min. 

5 

10 

15 

20 

25 

30 

35 

40 

45 

50 

60 

75 

Gals. 

per 

min. 

5 • 

.006 

.012 

.019 

.025 

.031 

.037 

.044 

.05 

.06 

.06 

.07 

.09 

5 

10 

.012 

.025 

.037 

.050 

.062 

.075 

.087 

.10 

.11 

.12 

.15 

.19 

10 

15 

.019 

.037 

.056 

.075 

.094 

.112 

.131 

.15 

.17 

.19 

.22 

.28 

15 

20 

.025 

.050 

.075 

.100 

.125 

.150 

.175 

.20 

.22 

.25 

.30 

.37 

20 

25 

.031 

.062 

.093 

.125 

.156 

.187 

.219 

.25 

to 

oo 

.31 

.37 

.47 

25 

30 

.037 

.075 

.112 

.150 

.187 

.225 

.262 

.30 

.34 

.37 

.45 

.56 

30 

35 

.043 

.087 

.131 

.175 

.219 

.262 

.306 

.35 

.39 

.44 

.52 

.66 

35 

40 

.050 

.100 

.150 

.200 

.250 

.300 

.350 

.40 

.45 

.50 

.60 

.75 

40 

45 

.056 

.112 

.168 

.225 

.281 

.337 

.394 

.45 

.51 

.56 

.67 

.84 

45 

50 

.062 

.125 

.187 

.250 

.312 

.375 

.437 

.50 

.56 

.62 

.75 

.94 

50 

60 

.075 

.150 

.225 

.300 

.375 

.450 

.525 

.60 

.67 

.75 

.90 

1.12 

60 

75 

.095 

.187 

.281 

.375 

.469 

.562 

.656 

.75 

.84 

.94 

1.12 

1.40 

75 

90 

.112 

.225 

.337 

.450 

.562 

.675 

.787 

.90 

1.01 

1.12 

1.35 

1.68 

90 

100 

.125 

.250 

.375 

.500 

.625 

.750 

.875 

1.00 

1.12 

1.25 

1.50 

1.87 

100 

125 

.156 

.312 

.469 

.625 

.781 

.937 

1.094 

1.25 

1.41 

1.56 

1.87 

2.34 

125 

150 

.187 

.375 

.562 

.750 

.937 

1.125 

1.312 

1.50 

1.69 

1.87 

2.25 

2.81 

150 

175 

.219 

.437 

.656 

.875 

1.093 

1.312 

1.531 

1.75 

1.97 

2.19 

2.62 

3.28 

175 

200 

.250 

.500 

.750 

1.000 

1.250 

1.500 

1.750 

2.00 

2.25 

2.50 

3.00 

3.75 

200 

250 

.312 

.625 

.937 

1.250 

1.562 

1.875 

2.187 

2.50 

2.81 

3.12 

3.75 

4.69 

250 

300 

.375 

.750 

1.125 

1.500 

1.875 

2.250 

2.625 

3.00 

3.37 

3.75 

4.50 

5.62 

300 

350 

.437 

.875 

1.312 

1.750 

2.187 

2.625 

3.062 

3.50 

3.94 

4.37 

5.25 

6.56 

350 

400 

.500 

1.000 

1.500 

2.000 

2.500 

3.000 

3.500 

4.00 

4.50 

5.00 

6.00 

7.50 

400 

500 

.625 

1.250 

1.875 

2.500 

3.125 

3.750 

4.375 

5.00 

5.62 

6.25 

7.50 

9.37 

500 

Gals. 

per 

min. 

in  Feei 

Gals. 

per 

min. 

9(f 

100 

125 

150 

175 

200 

250 

300 

350 

400 

5 

.11 

.12 

.16 

.19 

.22 

.25 

.31 

.37 

.44 

.50 

5 

10 

.22 

.25 

.31 

.37 

.44 

.50 

.62 

.75 

.87 

1.00 

10 

15 

.34 

.37 

.47 

.56 

.66 

.75 

.94 

1.12 

1.31 

1.50 

15 

20 

.45 

.50 

.62 

.75 

.87 

1.00 

1.25 

1.50 

1.75 

2.00 

20 

25 

.56 

.62 

.78 

.94 

1.09 

1.25 

1.56 

1.87 

2.19 

2.50 

25 

30 

.67 

.75 

.94 

1.12 

1.31 

1.50 

1.87 

2.25 

2.62 

3.00 

30 

35 

.79 

.87 

1.08 

1.31 

1.53 

1.75 

2.19 

2.62 

3.06 

3.50 

35 

40 

.90 

1.00 

1.25 

1.50 

1.75 

2.00 

2.50 

3.00 

3.50 

4.00 

40 

45 

1.01 

1.12 

1.41 

1.69 

1.97 

2.25 

2.81 

3.37 

3.94 

4.50 

45 

60 

1.12 

1.25 

1.56 

1.87 

2.19 

2.50 

3.12 

3.75 

4.37 

5.00 

50 

60 

1.35 

1.50 

1.87 

2.25 

2.62 

3.00 

3.75 

4.50 

5.25 

6.00 

60 

75 

1.69 

1.87 

2.34 

2.81 

3.28 

3.75 

4.69 

5.62 

6.56 

7.50 

75 

90 

2.02 

2.25 

2.81 

3.37 

3.94 

4.50 

5.62 

6.75 

7.87 

9.00 

90 

100 

2.25 

2.50 

3.12 

3.75 

4.37 

5.00 

6.25 

7.50 

8.75 

10.00 

100 

125 

2.81 

3.12 

3.91 

4.69 

5.47 

6.25 

7.81 

9.37 

10.94 

12.50 

125 

150 

3.37 

3.75 

4.69 

5.62 

6.56 

7.50 

9.37 

11.25 

13.12 

15.00 

150 

175 

3.94 

4.37 

5.47 

6.56 

7.66 

8.75 

10.94 

13.12 

15.31 

17.50 

175 

200 

4.50 

5.00 

6.25 

7.50 

8.75 

10.00 

12.50 

15.00 

17.50 

20.00 

200 

250 

5.62 

6.25 

7.81 

9.37 

10.94 

12.50 

15.72 

18.75 

21.87 

25.00 

250 

300 

6.75 

7.50 

9.37 

11.25 

13.12 

15.00 

18.75 

22.50 

26.25 

30.00 

300 

350 

7.87 

8.75 

10.94 

13.12 

15.31 

17.50 

21.87 

26.25 

30.62 

35.00 

350 

400 

9.00 

10.00 

12.50 

15.00 

17.50 

20.00 

25.00 

30.00 

35.00 

40.00 

400 

500 

11.25 

12.50 

15.62 

18.75 

21.87 

25.00 

31.25 

37.50 

43.75 

50.00 

500 

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